> It's not good to bring an always-on Internet connection straight onto an
> internal LAN, you need something running firewall software in the way.

I'd normally suggest a router doing NAT, plus firewall software on each PC,
but I believe there were some price objections somewhere along the way.

> Two NICs in the main machine is the way to go.

Only if you know how to individually set them up.  A router is still a good
idea.

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